I also work in the construction industry sefri. If you are optimistic, then you will believe that the worst of the global crisis is over and things will start to gradually get better. Some developers in Dubai are already begining to recruit again. So you should hang on to your job which sounds like a good offer and wait a little.
If you are pessimistic you will beleive what some analysts have been calling the begining of a new great depression which will last for quite some time.
Either way, Qatar has loads of projects begging to start and enough resources to go on despite the crisis. My advice: your chances in Qatar are better.